Add the missing preposition of to three of the sentences below.

1. A couple my friends are deep thinkers, which makes them interesting to talk to about life's ups and downs.

2. Though normally confident, many the people on the stage that night were in fact very nervous.

3. Not all teenagers are eager to spend time with their friends at the weekends.

4. No exam will ever be as hard as the one you have to take at the end of this course.

5. Elsa's pen broke , but luckily none the ink spilled out into her handbag.

6. Both rooms had been painted a shade of blue that reminded Hannah of her favourite flowers.